<template>
  <view v-if="goods_info.goods_name">
		<!-- 轮播图区域 -->
		<swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000" :circular="true">
		  <swiper-item v-for="(item, i) in goods_info.pics" :key="i">
		    <image :src="item.pics_big" @click="preview(i)"></image>
		  </swiper-item>
		</swiper>
    <!-- 商品信息区域 -->
    <view class="goods-info-box">
      <!-- 商品价格 -->
      <view class="price">￥{{goods_info.goods_price}}</view>
      <!-- 信息主体区域 -->
      <view class="goods-info-body">
        <!-- 商品名称 -->
        <view class="goods-name">{{goods_info.goods_name}}</view>
        <!-- 收藏 -->
        <view class="favi">
          <uni-icons type="star" size="18" color="gray"></uni-icons>
          <text>收藏</text>
        </view>
      </view>
      <!-- 运费 -->
      <view class="yf">快递：免运费 -- {{cart.length}}</view>
    </view>
	
    <!-- 商品详情信息 -->
    <rich-text :nodes="goods_info.goods_introduce"></rich-text>
    
    <view class="goods_nav">
      
    <uni-goods-nav  :options="options" :buttonGroup="buttonGroup"  @click="onClick" @buttonClick="buttonClick" />
    </view>
  </view>
</template>

<script>
  import { mapState,mapMutations, mapGetters } from 'vuex'
	export default {
		data() {
			return {
				 // 商品详情对象
				    goods_info: {},
            // 左侧按钮组的配置对象
            options: [{
              icon: 'shop',
              text: '店铺'
            }, {
              icon: 'cart',
              text: '购物车',
              info: 0
            }],
            // 右侧按钮组的配置对象
                buttonGroup: [{
                    text: '加入购物车',
                    backgroundColor: '#ff0000',
                    color: '#fff'
                  },
                  {
                    text: '立即购买',
                    backgroundColor: '#ffa200',
                    color: '#fff'
                  }
                ]
			}
		},
    computed:{
        ...mapState('m_cart', ['cart']),
        ...mapGetters('m_cart',['total'])
    },
    onLoad({goods_id}) {
      this.getGoodsDetail(goods_id)
    },
    watch: {
        // 1. 监听 total 值的变化，通过第一个形参得到变化后的新值
        total:{
          handler(newVal) {
            // 2. 通过数组的 find() 方法，找到购物车按钮的配置对象
            const findResult = this.options.find((x) => x.text === '购物车')
      
            if (findResult) {
              // 3. 动态为购物车按钮的 info 属性赋值
              findResult.info = newVal
            }
          },
          immediate:true
        },
      },
		methods: {
      ...mapMutations('m_cart',['addToCart']),
       onClick (e) {
         if(e.index===1){
           uni.switchTab({
             url:'/pages/cart/cart'
           })
         }
        },
        buttonClick (e) {
          if(e.index===0){
            // 加入购物车行为
            this.addToCart({
              goods_id:this.goods_info.goods_id, 
              goods_name:this.goods_info.goods_name, 
              goods_price:this.goods_info.goods_price, 
              goods_count:1, 
              goods_small_logo:this.goods_info.goods_small_logo, 
              goods_state:true
            })
          }else{
            // 立即购买行为
          }
        },
			 // 定义请求商品详情数据的方法
			  async getGoodsDetail(goods_id) {
			    const { data: res } = await uni.$http.get('/api/public/v1/goods/detail', { goods_id })
			    if (res.meta.status !== 200) return uni.$showMsg()
			    // 为 data 中的数据赋值
          res.message.goods_introduce = res.message.goods_introduce.replaceAll('<img ','<img style="display:block; "').replace(/webp/g, 'jpg')
			    this.goods_info = res.message
			  },
        // 实现轮播图的预览效果
        preview(i) {
          // 调用 uni.previewImage() 方法预览图片
          uni.previewImage({
            // 预览时，默认显示图片的索引
            current: i,
            // 所有图片 url 地址的数组
            urls: this.goods_info.pics.map(x => x.pics_big)
          })
        }
		}
	}
</script>

<style lang="scss" scoped>
  .goods-detail-container {
    // 给页面外层的容器，添加 50px 的内padding，
    // 防止页面内容被底部的商品导航组件遮盖
    padding-bottom: 50px;
  }
  
  .goods_nav {
    // 为商品导航组件添加固定定位
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
  }
swiper {
  height: 750rpx;

  image {
    width: 100%;
    height: 100%;
  }
}
// 商品信息区域的样式
.goods-info-box {
  padding: 10px;
  padding-right: 0;

  .price {
    color: #c00000;
    font-size: 18px;
    margin: 10px 0;
  }

  .goods-info-body {
    display: flex;
    justify-content: space-between;

    .goods-name {
      font-size: 13px;
      padding-right: 10px;
    }
    // 收藏区域
    .favi {
      width: 120px;
      font-size: 12px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      border-left: 1px solid #efefef;
      color: gray;
    }
  }

  // 运费
  .yf {
    margin: 10px 0;
    font-size: 12px;
    color: gray;
  }
}
</style>
